<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<p th:text="${msg}" style="color: red;"></p>
<form th:action="@{login}">
    <input name="username" type="text" placeholder="用户名">
    <input name="password" type="text" placeholder="密码">
    <input type="submit" value="登录">
</form>
</body>
</html>
